You are definitely the owner, without a doubt. As someone else pointed out, the owner of what, precisely, is up for debate, but certainly you have copyrights in some aspects of the work. From an enforcement perspective the substantive legal questions are what rights, and especially the scope of such rights, you implicitly granted or waived by publishing or sharing.

However, you don't really need to answer those questions before notifying, say, a recruiter that you're exercising your rights (such as they are) and demanding that they delete your resume. But how can you ensure compliance? For how long are you willing to check? And if they fail to fully comply are you willing to pay the expense to litigate, especially without the prospect of any monetary damages, let alone damages sufficient to cover the costs of litigation?

These limitations to enforcement at the threshold effectively moot the substantive legal questions. Some of the legal questions may not have ever been answered by a court simply because it's never been worth anyone's effort to press them.